wp_list_page, the parent page and underneath subpages

I need help wp_list_pages obtain this code:

<ul>
                                <li>
                                        <a href="#">Menu Item</a>
                                        <ul>
                                                <li><a href="#">Menu Subitem 1</a></li>
                                                <li><a href="#">Menu Subitem 2</a></li>
                                                <li><a href="#">Menu Subitem 3</a></li>
                                        </ul>
                                </li>
                                <li>
                                        <a href="#"><span class="l"></span><span class="r"></span><span class="t">Menu Item 2</span></a>
                                </li>
                        </ul>

Thank you very much.